[Elecraft] IC-7610 added to Sherwood's list

[WILLIE BABER]

How is it possible to compare the dynamic range of a direct conversion radio with a superhet, where a mode-specific filter can be placed at the first mixer, with the expectation that direct conversion would give similar dynamic range as a superhet?

I haven't heard yet a technical way to explain this, especially given how Wes Hayward defined how to measure receiver dynamic range many years ago.

73, Will, wj9b


CWops #1085
CWA Advisor levels II and III
http://cwops.org/

--------------------------------------------
On Sun, 12/24/17, Joe Subich, W4TV <lists at subich.com> wrote:

 Subject: Re: [Elecraft] IC-7610 added to Sherwood's list
 To: elecraft at mailman.qth.net
 Date: Sunday, December 24, 2017, 5:03 PM
 
 
 On 12/24/2017
 5:32 PM, Don Wilhelm wrote:
  > The real
 shocker is the BDR: only 119 to 122 dB. That’s 30 dB
 weaker
  > than the K3S and only 1 dB
 better than the IC-7300.
 
 My
 guess is that the "Front end selectivity" is not
 an "A tracking
 preselector" but
 rather a "B Band Pass" and that the bandpass is
 wider that that of the 7300 in order to support
 the "dual RX"
 capability of the
 7610.  It's either that or the design/hardware
 has some significant bugs.
 
 The other explanation would be simply that
 direct sampling SDR has a
 far wider
 measurement variability than traditional receiver
 topology.
 Note the 12 dB difference in
 IMDDR3 between Flex 6700 on 9/29/14 and
 the
 Flex 6700 measured on 3/17/17.
 
 73,
 
     ...
 Joe, W4TV
 
 
 On 12/24/2017 5:32 PM, Don Wilhelm wrote:
 > Rob’s IC-7610 RX performance
 measurements are now posted, at 
 >
 sherweng.com. The ‘7610 came in twelfth on his list.
 > The real shocker is the BDR: only 119 to
 122 dB. That’s 30 dB weaker 
 > than the
 K3S and only 1 dB better than the IC-7300. I guess no one is
 
 > using these rigs in high-signal
 conditions.
 > 
 >
 Bragging rights for the K3, KX3 and K3S owners.
 > 
 > 73,
 > Don W3FPR
 >
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